the Biology of some British Neurojitera. 547 



ish in colour, with faint indications of a pair of latero- 

 dorsal lines. The head markings are practically the same 

 as in the full-grown larva. In the second instar the bodv 

 markings are more distinct, but their full depth of colour 

 is reached in the third instar. 



Description of Third-Instar Larva. (Plate XL, fig. 8.) 



Length from 8-9 mm. Body elongated, smooth. General 

 colour varies from creamy-white to orange or j)ale reddish- brown, 

 with two, rather indistinct, latero-dorsal lines, madder brown.' 



The head is shorter and broader than that of Hemerobius, the 

 greatest breadth being between the eyes. The upper surface ia 

 greyish or light fuscous, with a darker central portion, not so sharply 

 wedge-shaped as in Hevierobius, but somewhat romided behind. This 

 is separated from the dark shaded sides by a lighter, Y-staj)ed 

 sunken line (frontal suture) . At the level of the eye, laterally, the 

 head is lighter, and the lower surface is greyish- v\'hite. Eyes black. 

 Antermae long, with palpi and jaws, blackish. The jaws become 

 darker distally, but for the last eighth are castaneous. 



The body is very elongate. It often has a decidedly reddish tinge 

 and is not conspicuously marked, except in examples with a lighter 

 ground-colour. In one pinkish-white specimen the latero-dorsal 

 brown bands are far more noticeable than is usual. The thorax is 

 of the same rosy hue as the rest of the body, except that the slight 

 lateral prominences of meso- and metathorax are often more 

 creamy-white and conspicuous. In the prothorax there is a pair 

 of scarcely pigmented, semi-lunar sclerites, lying on the outer 

 margins of the latero-dorsal bands. Meso- and metathorax have 

 each a pair of smaller, more rounded, shiny sclerites. A pair of 

 madder brovvu, ill-defined, latero-dorsal bands run the length of 

 the body, and between them, commencing in the hind part of the 

 prothorax, is a median blackish line. Laterally a pale brownish 

 line follows the sjjiracles, but this is not always very clearly marked. 

 Tip of abdomen blackish. Vcntraljy tlie bodj^ is uniformly reddish- 

 white. Legs smoky-white, blackish at the joints and extremities 

 of the tarsi. 



The entire build of the larva is more slender than that 

 of Hemerobius, the legs also appear longer. In some 

 respects it is similar to a Chrysopid larva such as G. flava, 

 especially in the outline of the head and thorax. The 

 trumpet-shaped empodium, so characteristic of Chrysojia 

 in all instars is, however, here present only in the first 

 instar, as usual for Hemerobiids. 



TKANS. ENT. SOC. LOND. 1922. — PAPvTS III, IV. (FEB. '23) O 



